Why not square rungs?
They are uncomfortable to work on for longer jobs. Where both sections of the ladder overlap, your feet have to point down at an angle to be on both rungs, which hurts your ankles. Or you end up trying to keep your feet horizontal, therefore teetering on a sort of pivot point at the corner of the square.
With D rungs, they stay in the same plane (i.e horizontal) when the ladder is at the correct angle on the wall....
This also applies when your feet are only on a single rung, D rungs give you a flat surface, horizontally,. Square rungs give you a 15 degree pointing away from you downward slope to stand on.
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